package com.hmdp.service.impl;

import com.hmdp.config.RedissonConfig;
import com.hmdp.dto.Result;
import com.hmdp.entity.SeckillVoucher;
import com.hmdp.entity.VoucherOrder;
import com.hmdp.mapper.VoucherOrderMapper;
import com.hmdp.service.ISeckillVoucherService;
import com.hmdp.service.IVoucherOrderService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.RedisIdWorker;
import com.hmdp.utils.SimpleRedisLock;
import com.hmdp.utils.UserHolder;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.aop.framework.AopContext;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.time.LocalDateTime;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 */
@Service
public class VoucherOrderServiceImpl extends ServiceImpl<VoucherOrderMapper, VoucherOrder> implements IVoucherOrderService {

    @Resource
    private ISeckillVoucherService iSeckillVoucherService;

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Resource
    private RedisIdWorker redisIdWorker;

    @Resource
    private RedissonClient redissonClient;

    /**
     * 秒杀优惠券
     * @param voucherId
     * @return
     */
    @Override
    @Transactional
    public Result seckillVoucher(Long voucherId) {
        //1.查询优惠券
        SeckillVoucher seckillVoucher = iSeckillVoucherService.getById(voucherId);
        //2.判断秒杀是否开始
        if (seckillVoucher.getBeginTime().isAfter(LocalDateTime.now())) {
            return Result.fail("秒杀尚未开始");
        }
        //3.判断秒杀是否结束
        if (seckillVoucher.getEndTime().isBefore(LocalDateTime.now())) {
            return Result.fail("秒杀已经结束");
        }
        //4.判断库存是否充足
        if (seckillVoucher.getStock()<1) {
            return Result.fail("库存不足");
        }
        Long userId = UserHolder.getUser().getId();

        //获取锁
        //SimpleRedisLock lock=new SimpleRedisLock("order"+userId,stringRedisTemplate);
        RLock lock = redissonClient.getLock("lock:order" + userId);
        //获取锁
        boolean tryLock = lock.tryLock();
        if (!tryLock){
            return Result.fail("不能一个id多抢");
        }
        try {
            IVoucherOrderService proxy = (IVoucherOrderService) AopContext.currentProxy();
            return proxy.createVoucherOrder(voucherId);
        } finally {
            //释放锁
            lock.unlock();
        }
    }

    @Transactional
    public Result createVoucherOrder(Long voucherId) {
        //判断用户之前是否下过单，每个用户只能有一单
        Long userId = UserHolder.getUser().getId();
        Integer count = query().eq("user_id", userId)
                .eq("voucher_id", voucherId).count();
        if (count>0){
            return Result.fail("每个用户限购买一张");
        }

        //5.扣减库存
        boolean success = iSeckillVoucherService.update()
                .setSql("stock=stock-1")
                .eq("voucher_id", voucherId)
                .gt("stock",0)
                .update();
        if (!success) {
            return Result.fail("库存不足");
        }
        //6.创建订单
        VoucherOrder voucherOrder=new VoucherOrder();
        //6.1.订单id
        long orderId = redisIdWorker.nextId("order");
        voucherOrder.setId(orderId);
        //6.2.用户id

        voucherOrder.setUserId(userId);
        //6.3.代金券id
        voucherOrder.setVoucherId(voucherId);
        //6.4.添加到数据库
        save(voucherOrder);
        //7.返回订单ID
        return Result.ok(orderId);
    }
}
